CN217132347U - Non-contact array type distribution optical fiber device - Google Patents
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Abstract
The utility model discloses a non-contact array type distributed optical fiber device, which comprises an installation base, wherein the installation base comprises a shock absorption base and a supporting device, the shock absorption base is provided with at least one supporting device, and a plurality of connecting winding points are arranged above the supporting device along the axis linear array; the monitoring device comprises an induction optical fiber and Brillouin optical time domain reflectometer equipment, wherein the induction optical fiber is arranged between two spaced, parallel and opposite mounting bases, is sequentially arranged at each connecting winding point on the supporting device and is of a continuous layered structure; one end of the sensing optical fiber is electrically connected with the Brillouin optical time domain reflectometer equipment. The method and the device can effectively solve the problem of simulation monitoring of the non-contact array distributed optical fiber sound wave testing technology, and establish the voiceprint information database of the building structural member in the fracture process to prepare for the application of the voiceprint information database to safety monitoring of the building structural member.
Description
Technical Field
The utility model belongs to the technical field of the structural health monitoring, concretely relates to non-contact type array distribution optical fiber device.
Background
With the planning and construction of a large number of urban infrastructures, China becomes the region with the fastest global economic development and the largest engineering construction scale. In this context, the quality requirements of people for construction engineering are constantly increasing. Modern engineering faces the problems of more difficulty, high difficulty, large investment and the like, and building structures develop towards super high-rise, large space and large span; therefore, the safety requirements are gradually increased. However, in the using stage of a building, due to a plurality of factors such as stress action, fatigue effect, environmental temperature and humidity, aging corrosion and the like, a plurality of signs are presented before many safety accidents occur, and structural damage and resistance performance decline all cause catastrophic accidents.
The monitoring of the modern building structure is an important means for the safety early warning of the structure, and has important significance for the civil engineering discipline and the engineering practice. On one hand, monitoring aiming at major engineering is very effective for guaranteeing the safety and risk control of engineering projects, and a large number of engineering accidents show that abnormity can be found from monitoring data before the accidents occur, so that early warning can be realized. On the other hand, the development of civil engineering structural tests also requires continuous progress of monitoring techniques to meet the more intensive and rigorous research needs.
In recent years, with the increasing design requirements for the whole life of building structures, new tasks and requirements for health monitoring of building structural members have been proposed. The existing building structural member health monitoring technology classifies monitoring equipment into contact monitoring equipment and non-contact monitoring equipment according to whether the monitoring equipment needs to be in contact with a detected structure; the traditional contact monitoring means, such as patch type strain, vibration monitoring and other technologies, have the defects of difficult layout, discrete monitoring points, poor long-term monitoring reliability and the like; therefore, non-contact monitoring means are generated at the same time and become a hotspot for researching the structure monitoring technology, and the traditional monitoring technology such as steel structure ultrasonic flaw detection monitoring, reflected wave low-strain method pile foundation strength measurement and the like belong to the category of non-contact monitoring equipment. Currently, ultrasonic detection is the most widely used nondestructive testing technique. The basic principle of the ultrasonic method for detecting the building structure is that when ultrasonic waves are transmitted in a detected material, the ultrasonic waves are influenced by the acoustic characteristics and internal tissue changes of the material, and the damage degree of the detected material is known through detecting the influence degree of the ultrasonic waves. However, the traditional non-contact monitoring equipment such as ultrasonic waves and the like cannot detect the breaking damage and the like of the component in time, and cannot realize real-time monitoring on the condition of the building component; and the monitoring method has low measurement precision, and cannot accurately measure the fracture damage condition of the building member.
At present, no device and method for applying a non-contact type array distributed optical fiber acoustic wave testing technology to monitoring of building structural members exist. In order to further promote the application of the non-contact array distributed optical fiber sound wave testing technology in a building structure, solve the problem of simulation monitoring of the non-contact array distributed optical fiber sound wave testing technology, and construct a sound wave frequency and a vibration voiceprint information database when different building materials are damaged and broken, a non-contact array distributed optical fiber device needs to be designed, and in addition, a simulation monitoring method needs to be designed to guide the experiment development and obtain the vibration voiceprint information when different building materials are damaged and broken.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the main objective of the present invention is to provide a non-contact array type distribution optical fiber device with simple structure, strong anti-interference performance and high measurement accuracy.
The utility model aims at realizing through the following technical scheme:
a non-contact array type distributed optical fiber device comprises a mounting base, wherein the mounting base comprises a shock absorption base and a supporting device, at least one supporting device is arranged on the shock absorption base, and a plurality of connecting winding points are arranged above the supporting device along the axis of the supporting device in a linear array manner; the monitoring device comprises an induction optical fiber and Brillouin optical time domain reflectometer equipment, wherein the induction optical fiber is arranged between two spaced, parallel and opposite mounting bases, sequentially wound around each connecting winding point arranged on the supporting device and in a continuous layered structure; one end of the induction optical fiber is electrically connected with the Brillouin optical time domain reflectometer equipment.
Preferably, the supporting device is formed by connecting a plurality of threaded straight rods, the lower ends of the threaded straight rods are provided with screw rods, the inner walls of the upper ends of the threaded straight rods are annularly provided with threads, and the adjacent threaded straight rods are fixedly connected with the threads through the screw rods.
Preferably, the damping base comprises an upper fixing plate and a lower fixing plate, and a damping layer is fixedly arranged between the upper fixing plate and the lower fixing plate.
Preferably, a plurality of shock absorbing devices are further arranged inside the shock absorbing layer, and the shock absorbing devices are damping spring shock absorbers.
Preferably, wherein upper fixed plate, buffer layer and bottom plate are the rectangular plate, upper fixed plate's up end is provided with a plurality of screw holes and threaded connection strutting arrangement, be provided with a plurality of through-holes in the buffer layer, buffer run through set up in the through-hole, just buffer device's upper end fixed connection is in upper fixed plate, and lower extreme fixed connection is in the bottom plate, the lower terminal surface of bottom plate still evenly is provided with a plurality of rubber cushion.
Preferably, wherein the upper portion of strutting arrangement still be provided with connect winding point assorted latch mechanism, latch mechanism includes a plurality of fixed bolsters that top-down interval set up, be provided with the optical fiber slot of width and the direct matching of response optic fibre on the fixed bolster, response optic fibre passes through the fixed bolster and fixes setting up on strutting arrangement.
Preferably, the number of the supporting devices is 1-6, the number of the fixing brackets is 1-60, the number of the shock absorption devices is 2-8, and the number of the rubber cushion blocks is 2-8.
Compared with the prior art, the utility model discloses at least, following advantage has:
1) the non-contact array type distributed optical fiber device provided by the utility model avoids pre-embedding of monitoring equipment during construction, reduces the construction difficulty, simultaneously avoids the change of the performance of the structural member due to embedding of the monitoring equipment, improves the safety of the structural member, and also saves the construction cost and time;
2) the utility model provides a non-contact type array distribution optical fiber device can monitor to current building structure's external data, through set up non-contact type array distribution optical fiber device outside building element, under the prerequisite that does not change building element inner structure, can realize the health monitoring to current building element, and this monitoring devices has the great meaning to the safe labour of current building element;
3) the utility model provides a non-contact type array distribution optical fiber device can carry out long-term real-time supervision to current building structure's external data, when the signal of the vibration voiceprint information among this non-contact type array distribution optical fiber device changes, can judge structural component that awaits measuring abnormal conditions (like unusual conditions such as crackle, damage and fracture) appear, and then realize the monitoring to the safety service of structural component that awaits measuring.
4) The utility model provides a non-contact type array distribution optical fiber device, it has the distributing type, the precision is high, the test is convenient, the cost is lower, therefore, the clothes hanger is strong in practicability, vibration voiceprint information when damaging the fracture through Brillouin optical time domain reflectometer equipment collection and storage structure component, through carrying out corresponding simulation monitoring experiment to different building materials, through the simulation monitoring experiment, simulate on-the-spot actual conditions, thereby seek the corresponding relation between vibration voiceprint information and the different materials, construct vibration voiceprint information database, thereby prepare for the in-service use of follow-up building component.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of a non-contact array type distribution optical fiber device according to the present application;
FIG. 2 is a schematic diagram of a mounting base of the non-contact array type distribution optical fiber device according to the present application;
FIG. 3 is a diagram illustrating a layout of a non-contact arrayed distribution fiber optic device according to the present application;
FIG. 4 is a schematic view of another arrangement of a non-contact array type distribution optical fiber device according to the present application;
FIG. 5 is a schematic view of another arrangement of a non-contact array type distribution optical fiber device according to the present application;
FIG. 6 is a schematic view of another arrangement of the non-contact array type distribution optical fiber device according to the present application;
FIG. 7 is a schematic view of another arrangement of the non-contact array type distribution optical fiber device according to the present application;
FIG. 8 is a graph of a voiceprint plot of ambient (white) noise at the time of the experiment provided by an embodiment of the present application;
FIG. 9 is a graph of the voiceprint of a 10mm rebar (model HRB500E) during breaking according to the experiments provided by the examples in this application;
FIG. 10 is a graph of the voiceprint during fracture of a 12mm rebar (model HRB500E) during an experiment provided by an example of the present application;
fig. 11 is a graph of the voiceprint during the fracture of 10mm rebar (model HRB400E) during the experiments provided by the examples in this application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The description in this application as relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the following embodiments, the brillouin optical time domain reflectometer apparatus used is brillouin optical time domain reflectometer Ada-5034 developed by the cooperation of zhongmei architecture research institute limited company and beijing post and telecommunications university;
the adopted sensing optical fiber is FC (APC) -FC (APC)30m single-mode optical fiber jumper, and the subsequent expansion can be carried out to 10km according to the measurement range, and a single optical fiber needs to be continuous;
the type of the adopted steel bar material fatigue testing machine is a Sinco Tec 25-ton fatigue testing machine, and the damage and fracture sound pattern collection of different building materials is carried out according to the national mandatory standard of hot rolled ribbed steel bar for reinforced concrete (GB 1499);
the utility model provides a non-contact array type distributed optical fiber device, which comprises an installation base, wherein the installation base comprises a damping base and a supporting device, the damping base is provided with at least one supporting device, and a plurality of connecting winding points are arranged above the supporting device along the axis linear array; the monitoring device comprises an induction optical fiber and Brillouin optical time domain reflectometer equipment, wherein the induction optical fiber is arranged between two spaced, parallel and opposite mounting bases, sequentially wound around each connecting winding point arranged on the supporting device and in a continuous layered structure; one end of the induction optical fiber is electrically connected with the Brillouin optical time domain reflectometer equipment.
The Brillouin optical time domain reflectometer has the capability of measuring temperature and strain at the same time, and the refractive index of a medium fluctuates periodically along with time and space due to certain forms of vibration existing in medium molecules, so that a self-sounding wave field is generated; when light is directionally incident into the optical fiber medium, brillouin scattering is generated under the action of the acoustic wave field. Brillouin scattering in an optical fiber is manifested by the generation of a stokes wave that is shifted down in frequency relative to the incident pump wave and can be viewed as a parametric interaction between the pump wave and the stokes wave, acoustic wave. The amount of brillouin frequency shift produced by scattering is proportional to the speed of sound in the fiber:
f B ＝2nV A /η 1.1
the refractive index and sound velocity of the optical fiber are related to the temperature and stress of the optical fiber, so that Brillouin is realizedFrequency shift f B As these parameters change, both temperature and fiber strain cause a linear shift in brillouin frequency, namely:
it has been found experimentally that the brillouin scattering power increases linearly with increasing temperature and decreases linearly with increasing strain, i.e. the brillouin power can be expressed as:
wherein f is B (0) P0 represents brillouin frequency shift and power when T is 0 ═ 0 ℃ strain (μ ∈), respectively. The effect of strain on brillouin light power with respect to temperature is much less, and is generally negligible, whereas brillouin light power is considered to be temperature dependent. As can be seen from the expressions 1.2 and 1.3, the distribution information of the temperature, strain, and the like along the sensing fiber can be obtained by detecting the optical power and frequency of the brillouin scattered light.
Therefore, the strain of the building structural member is measured by the Brillouin optical time domain reflectometer equipment, the non-contact type array distribution optical fiber device inherits the advantages of the distributed optical fiber sensor, and the single distribution parameter measurement has high precision and spatial resolution.
The method mainly comprises the steps of collecting vibration voiceprints of different building materials, wherein the characteristic voiceprints of the different building materials during damage and fracture are mainly collected, and comprise peak-to-average ratio/zero crossing rate/signal duty ratio/average amplitude difference/kurtosis coefficient/skewness coefficient/peak ratio/trough ratio/ratio of long and short windows/ratio of primary and secondary peaks/central frequency/frequency bandwidth/signal power/signal energy/inverse-prime characteristic coefficient 1/inverse-prime characteristic coefficient 2/shape parameter/effective value and the like; or decomposing the vibration mode of the composite material by adopting an empirical mode decomposition method, and performing characteristic expansion on the mode with higher energy of the fracture signal, wherein the characteristic comprises a mode frequency and an intrinsic mode function.
The collected vibration voiceprint information of different building materials is used for subsequently forming a characteristic database of vibration voiceprint information of different building materials when the building materials are damaged and broken, and preparation is made for the device to be applied to building components.
Wherein vibration damping mount includes an upper fixed plate and a lower fixed plate, be provided with the buffer layer between upper fixed plate and the lower fixed plate. The upper fixing plate, the damping layer and the lower fixing plate are rectangular plates, the upper end face of the upper fixing plate is provided with a plurality of threaded holes and is in threaded connection with the supporting device, a plurality of through holes are formed in the damping layer, the damping device is arranged in the through holes in a penetrating mode, the upper end of the damping device is fixedly connected to the upper fixing plate, the lower end of the damping device is fixedly connected to the lower fixing plate, and the lower end face of the lower fixing plate is also uniformly provided with a plurality of rubber cushion blocks; further, a plurality of shock absorption devices are further arranged inside the shock absorption layer, and the shock absorption devices are damping spring shock absorbers.
The damping base is arranged, so that the influence of base movement on upper monitoring equipment caused by environmental vibration is reduced, and the monitoring accuracy is improved; suppose the base equation of motion is u g (t)＝u g 0sin omega t, the displacement transfer rate of the vibration damping base motion to the upper monitoring equipment can be obtained through derivation of a formula 1.11-1.17 due to a damping spring vibration absorber arranged in a vibration damping layer
Rate of transmission of acceleration
Thus, the total displacement of the device due to the movement of the damping mount is monitored
According to formula derivation, the damping spring vibration absorber arranged in the damping layer can be used for reducing the natural vibration frequency of the monitoring equipment to realize a good vibration isolation effect, so that the displacement error of the upper monitoring equipment is reduced, and the accuracy of monitoring data is improved.
Basic displacement:
u g (t)＝u g0 sinωt 1.11
displacement transmission rate:
acceleration transfer rate:
total displacement of upper monitoring device:
damping base in this application has fine vibration isolation effect promptly.
The supporting device is formed by connecting a plurality of threaded straight rods, a screw rod is arranged at the lower end of each threaded straight rod, threads are annularly arranged on the inner wall of the upper end of each threaded straight rod, and the adjacent threaded straight rods are fixedly connected with the threads through the screw rods. Through adopting screw thread straight-bar combined connection in this application, can improve the rigidity of support equipment, according to N cr ＝π 2 EA/λ 2 The Euler critical force of the compression rod system can be obtained, the P-delta second-order effect is considered, and the compression effect of the upper monitoring equipment on the supporting device can be obtained through calculation to meet the measurement precision requirement. Also, taking into account the sensing fiberThe pretension between the two parts has certain requirements on the rigidity of the supporting device. Therefore, the threaded connection is adopted, so that the overall rigidity of the supporting device is improved, and the displacement error of the top monitoring equipment is reduced, thereby improving the accuracy of the measuring result;
a simulation monitoring method for the non-contact array type distribution optical fiber device comprises the following steps:
1) arranging a non-contact array type distribution optical fiber device at the periphery of a structural component to be detected, wherein the sensing optical fiber on the non-contact array type distribution optical fiber device is 5cm-200cm away from the structural component to be detected;
specifically, the arrangement method comprises the steps that the structural component to be tested is placed on the outer side of the induction optical fiber in parallel, and the structural component to be tested and the induction optical fiber are placed in parallel;
or the arrangement method also comprises the steps that the structural component to be tested is placed in the middle of the induction optical fiber in parallel, and the structural component to be tested and the induction optical fiber are placed vertically;
2) the method comprises the steps of pressurizing a structural component to be tested, breaking the structural component to be tested after bearing pressure, generating vibration voiceprint information in the breaking process, transmitting the vibration voiceprint information to sensing optical fibers of a non-contact array type distribution optical fiber device placed on the periphery of the structural component to be tested, and collecting vibration voiceprint signals by the sensing optical fibers to be transmitted and stored to Brillouin optical time domain reflectometer equipment.
Example 1
As shown in fig. 1 and 2, a non-contact array type distributed optical fiber device includes a mounting base, the mounting base includes a shock-absorbing base 11 and a supporting device 12, at least one supporting device 12 is disposed on the shock-absorbing base 11, and a plurality of connection winding points are uniformly disposed above the supporting device 12 along an axis line array thereof; the monitoring device comprises an induction optical fiber 21 and Brillouin optical time domain reflectometer equipment 22, wherein the induction optical fiber 21 is arranged between two spaced, parallel and opposite mounting bases, sequentially wound around each connecting winding point on the supporting device 12 and is of a continuous layered structure; specifically, the sensing optical fiber 21 is continuously and uniformly wound to and fro at each connection winding point above the supporting device 12 (i.e. a line formed by winding points on the left side and the right side is regarded as a detection point, and one sensing optical fiber wound to and fro is regarded as two detection points), and each sensing optical fiber 21 between two mounting bases is a detection point; therefore, the non-contact array type distribution optical fiber device of the application, through setting up the sensing optical fiber between two interval, parallel, relative mounting bases, and twine each connection winding point that sets up on strutting arrangement in proper order, be continuous lamellar structure and form a plurality of check points, specific winding pass that makes a round trip can be according to actual monitoring's needs and the aspect comprehensive consideration in the aspect of the cost control, set up by oneself, the more the pass that sets up, the more the check point promptly, the data that the monitoring gained are just more accurate, one end and the brillouin optical time domain reflectometer equipment 22 electricity of this sensing optical fiber 21 are connected. When the system is used, a large amount of vibration voiceprint information of different building materials is acquired through the non-contact array type distribution optical fiber devices, so that a database of vibration voiceprint information of different building materials is formed, technical support is provided for realizing dynamic and visual monitoring of building structural members and achieving information construction, and the system can be widely applied to monitoring and monitoring of various building structural members.
Preferably, referring to fig. 1 and 2 again, in a preferred technical solution in the present embodiment, the supporting device 12 is formed by connecting a plurality of threaded straight rods, the lower ends of the threaded straight rods are provided with screw rods, the inner wall of the upper ends is provided with threads in a ring manner, and the threaded straight rods adjacent to each other are fixedly connected with the threads through the screw rods. Specifically, the supporting device mainly comprises a plurality of threaded straight rods, and the threaded straight rods which are adjacent to each other are connected with each other in a combined mode through a screw rod and threads; and then change the length of screw thread straight bar, realize adjusting strutting arrangement to the realization is adjusted strutting arrangement upper portion's monitoring facilities's height, and then realizes monitoring the building structure component of co-altitude not.
Preferably, referring to fig. 1 and fig. 2 again, in another preferred technical solution of this embodiment, the vibration damping mount 11 includes an upper fixing plate 111 and a lower fixing plate 112, a vibration damping layer 113 is fixedly disposed between the upper fixing plate 111 and the lower fixing plate 112, wherein the upper fixing plate 111, the vibration damping layer 113 and the lower fixing plate 112 are all rectangular plates, the upper end surface of the upper fixing plate 111 is provided with a plurality of threaded holes and is in threaded connection with the supporting device 12, and the upper fixing plate 111 is in threaded connection with the supporting device 12, so that the overall rigidity of the supporting device 12 is improved, and the displacement error of the upper monitoring device is reduced, thereby improving the accuracy of the measurement result; a plurality of through holes are formed in the damping layer 113, the damping device 1131 is arranged in the through holes in a penetrating manner, the upper end of the damping device 1131 is fixedly connected to the upper fixing plate 111, the lower end of the damping device 1131 is fixedly connected to the lower fixing plate 112, and a plurality of rubber cushion blocks (not shown in the figure) are uniformly arranged on the lower end surface of the lower fixing plate 112; wherein, a plurality of shock absorbing devices 1131 are further disposed inside the shock absorbing layer 113, and the shock absorbing devices 1131 are damping spring shock absorbers. According to the vibration isolation device, the damping spring shock absorber is arranged in the shock absorption layer, so that the natural vibration frequency of the monitoring equipment is reduced to achieve a good vibration isolation effect, the displacement error of the monitoring device is reduced, and the accuracy of monitoring data is improved; a plurality of rubber cushion blocks are uniformly arranged on the lower end face of the lower fixing plate, so that the natural vibration frequency of the monitoring equipment is further reduced, and technical support is provided for further improving the accuracy of the monitoring data.
Example 2
On the basis of embodiment 1, referring to fig. 1 and fig. 2 again, wherein the upper portion of the supporting device 12 is further provided with a clamping mechanism matching with the connection winding point, the clamping mechanism includes a plurality of fixing brackets 31 arranged at intervals from top to bottom, the fixing brackets 31 are provided with optical fiber clamping grooves 32 having widths directly matching with the sensing optical fibers 21, and the sensing optical fibers 21 are fixedly arranged on the supporting device 12 through the fixing brackets 31. Specifically, the sensing optical fiber is fixed on the supporting device through the fixing support, so that the sensing optical fiber can be combed, and the sensing optical fiber is prevented from being wound; and the arrangement of the optical fiber clamping groove can avoid the condition that the connection part is loosened due to self gravity, so that the induction optical fiber is ensured to be kept at certain tension between the supporting devices, and further technical support is provided for further improving the accuracy of the monitoring data.
Preferably, in a preferred technical solution of the present embodiment, wherein the number of the supporting devices 12 is 1 to 6, the number of the fixing brackets 31 is 1 to 60, the number of the shock absorbing devices 1131 is 2 to 8, and the number of the rubber pads is 2 to 8; more preferably: the number of the supporting devices 12 is 2-4, the number of the fixing supports 31 is 3-30, the number of the shock absorption devices 1131 is 4-6, and the number of the rubber cushion blocks is 4-6, so that the non-contact array type distribution optical fiber device can be maintained at a lower production cost on the premise of ensuring the accuracy of monitoring data.
The simulation monitoring method based on the non-contact array type distribution optical fiber device comprises the following steps:
1) arranging a non-contact array type distribution optical fiber device at the periphery of a structural component to be detected, wherein the sensing optical fiber on the non-contact array type distribution optical fiber device is 5cm-200cm away from the structural component to be detected;
2) the method comprises the steps of pressurizing a structural component to be tested, breaking the structural component to be tested after bearing pressure, generating vibration voiceprint information in the breaking process, transmitting the vibration voiceprint information to sensing optical fibers of a non-contact array type distribution optical fiber device placed on the periphery of the structural component to be tested, and collecting vibration voiceprint signals by the sensing optical fibers to be transmitted and stored to Brillouin optical time domain reflectometer equipment.
Specifically, the non-contact array-type distributed optical fiber device in the application can adjust the number of the mounting bases, the number of the adopted supporting devices arranged on the damping base and the number of the fixing supports arranged on the axial surface of the upper part of the supporting devices according to the actual use requirement; specifically, for some strip-shaped structural members to be tested, such as a steel cable dome of a large public building and a prestressed steel strand net rack of a large glass curtain wall, the structural members to be tested can be arranged on the outer side of the sensing optical fiber in parallel, and the structural members to be tested and the sensing optical fiber are arranged in parallel; specifically, as shown in fig. 3, 4 and 5, the sensing optical fiber is wound between two spaced, parallel and opposite mounting bases, at this time, the short sides of the mounting bases are generally rectangular frames and are arranged in parallel, and simultaneously, the mounting bases penetrate through the connecting winding points at the upper ends of two supporting devices on the mounting bases to form an array linear structure, so as to form a monitoring sensing network;
for some structural members to be tested with large space occupation, such as steel strand inhaul cables of a cable-stayed bridge, the structural members to be tested can be arranged between the induction optical fibers in parallel, and the structural members to be tested and the induction optical fibers are arranged vertically; as shown in fig. 6 and 7, the sensing optical fiber is wound between two spaced, parallel and opposite mounting bases, and the long sides of the mounting bases, which are generally rectangular frames, are arranged in parallel, and simultaneously penetrate through the connecting winding points at the upper ends of the plurality of supporting devices on the mounting bases to form an array linear structure, so as to form a monitoring sensing network; this application is carried out laboratory and is verified on the spot to this non-contact type array distribution fiber device, specifically is:
laboratory experiment 1:
in a laboratory, the non-contact array type distribution optical fiber device provided by the application is subjected to a simulation test in the laboratory: the method specifically comprises the following steps: fixing a 10mm steel bar (model HRB500E) on a steel bar material fatigue testing machine, placing the non-contact array type distributed optical fiber device on the side of the steel bar material fatigue testing machine, placing the structural member (steel bar) to be tested at a position 10cm away from a side sensing optical fiber (namely, the steel bar is placed on the side of the sensing optical fiber), starting a power device of the steel bar material fatigue testing machine to drive the steel bar to draw in two directions, the steel bar is broken after bearing pressure, the energy (vibration/sound) released in the breakage generates vibration sound pattern information when the breakage occurs, the vibration is transmitted to the sensing optical fiber on the side of the steel bar, the sensing optical fiber acquires vibration/sound signals, transmits and stores the vibration/sound signals to Brillouin optical time domain reflectometer equipment, the curve of the steel bar at the moment of breakage is shown in figure 9, wherein figure 8 is an environment (white) noise curve, and can be known by comparing figure 8 with figure 9, the fracture process has obvious signal change, and the process is reproducible and repeatable, and the goodness of fit in the process is as high as 98.6%.
The supporting devices of the non-contact array type distributed optical fiber device used in the experiment are provided with 6 connecting winding points, and each mounting base is provided with 1 supporting device, as shown in fig. 3.
The same test method is adopted to carry out simulation test on 12mm steel bars (model HRB500E) and 10mm steel bars (model HRB400E), and the results are shown in figures 10 and 11, and the comparison between figures 8, 10 and 11 shows that the fracture process has obvious signal change and is reproducible and repeatable, and the repeatability of the process is as high as 98 percent.
Laboratory experiment 2:
the non-contact array type distribution optical fiber device provided by the application is subjected to a simulation test in a laboratory: fixing a 10mm steel bar (model HRB500E), a 12mm steel bar (model HRB500E) and a 10mm steel bar (model HRB400E) on a steel bar material fatigue testing machine, placing the non-contact array type distribution optical fiber device on the side of the steel bar material fatigue testing machine, placing a structural member (steel bar) to be tested 10cm away from induction optical fibers on two sides (namely, placing the steel bar in the middle of the induction optical fibers), starting a power device of the steel bar material fatigue testing machine, so that the steel bar is driven to be drawn in two directions, the steel bar is broken after bearing pressure, releasing energy (vibration/sound) in the breakage to generate vibration sound pattern information when the breakage, transmitting the vibration to the induction optical fibers on the side of the steel bar, and transmitting and storing the vibration/sound signals to Brillouin optical time domain reflectometer equipment by the induction optical fibers; the curve of the steel bar breaking moment is basically consistent with the vibration voiceprint information generated when the 10mm steel bar (model HRB500E), the 12mm steel bar (model HRB500E) and the 10mm steel bar (model HRB400E) in the laboratory experiment 1 break.
The supporting devices of the non-contact array type distributed optical fiber device adopted in the experiment are provided with 6 connecting winding points, and each mounting base is provided with 2 supporting devices, which is specifically shown in fig. 6.
Laboratory comparative example 1
The experimental method in the comparative example 1 is the same as that in the laboratory experiment 1, and the non-contact array type distribution optical fiber device in the comparative example is basically the same as that in the laboratory experiment 1, except that a damping layer is not arranged in a damping mount of the non-contact array type distribution optical fiber device; the detection result is as follows: the steel bar (10mm steel bar (model HRB500E), 12mm steel bar (model HRB500E), 10mm steel bar (model HRB400E) have signal change at cracked in-process, but the range of this signal change descends the shock attenuation base that has set up the buffer layer obviously, and the environmental vibration that the effective filtration base transmitted is failed, and the non-contact vibration sound line signal is difficult to effectively detect, therefore, it is not suitable for the monitoring when waiting to examine structural component damage or crackle.
Laboratory comparative example 2
The experimental method in the comparative example 1 is the same as that in the laboratory experiment 1, and the non-contact array type distribution optical fiber device in the comparative example is basically the same as that in the laboratory experiment 1, except that only 1, 2, 3, 4 and 5 connection winding points are arranged on the supporting device of the non-contact array type distribution optical fiber device; the detection result is as follows: the steel bar (10mm steel bar (model HRB500E), 12mm steel bar (model HRB500E), 10mm steel bar (model HRB400E) have signal change in the fracture process, and along with the increase of connection winding points (increase of detection points), the detection signal range of the monitored vibration signal on the Brillouin optical time domain reflectometer equipment is wider, the strength is enhanced to a certain extent, and the result reflects the sensitivity and effectiveness of the array type optical fiber in acquiring non-contact vibration signals compared with a single unwound optical fiber (single detection point).
Through the simulation experiment, the vibration voiceprint information of different building materials (steel bars, steel strands and the like) in the damage and fracture processes can be acquired by the non-contact array type distribution optical fiber device, and the vibration voiceprint information has repeatability aiming at the acquired information of the different building materials, so that the scheme that the non-contact array type distribution optical fiber device is used for monitoring the different building materials is feasible and reliable; meanwhile, the non-contact array type distributed optical fiber device provides technical support for establishing a complete failure voiceprint database (vibration voiceprint information of different building materials in abnormal states such as cracks, damages, fractures and the like).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A non-contact array type distributed optical fiber device is characterized by comprising an installation base, wherein the installation base comprises a shock absorption base and a supporting device, at least one supporting device is arranged on the shock absorption base, and a plurality of connecting winding points are arranged above the supporting device along the axis of the supporting device in a linear array manner; the monitoring device comprises an induction optical fiber and Brillouin optical time domain reflectometer equipment, wherein the induction optical fiber is arranged between two spaced, parallel and opposite mounting bases, sequentially wound around each connecting winding point arranged on the supporting device and in a continuous layered structure; one end of the induction optical fiber is electrically connected with the Brillouin optical time domain reflectometer equipment.
2. The non-contact array type distribution optical fiber device of claim 1, wherein the supporting device is formed by connecting a plurality of threaded straight bars, the threaded straight bars are provided with a screw rod at a lower end thereof, the inner wall of the upper end is provided with a thread, and the threaded straight bars adjacent to each other are fixedly connected with the thread through the screw rod.
3. The non-contact array type distribution optical fiber device according to claim 1 or 2, wherein the vibration-damping mount comprises an upper fixing plate and a lower fixing plate, and a vibration-damping layer is fixedly disposed between the upper fixing plate and the lower fixing plate.
4. The non-contact arrayed distribution optical fiber device of claim 3, wherein a plurality of vibration dampers are further disposed inside the vibration damper layer, and the vibration dampers are damping spring dampers.
5. The optical fiber device according to claim 4, wherein the upper fixing plate, the shock absorbing layer and the lower fixing plate are rectangular plates, the upper end surface of the upper fixing plate is provided with a plurality of threaded holes and is screwed with the supporting device, the shock absorbing layer is provided with a plurality of through holes, the shock absorbing device is penetratingly disposed in the through holes, the upper end of the shock absorbing device is fixedly connected to the upper fixing plate, the lower end of the shock absorbing device is fixedly connected to the lower fixing plate, and the lower end surface of the lower fixing plate is further uniformly provided with a plurality of rubber pads.
6. The non-contact array type distribution optical fiber device according to claim 5, wherein a clamping mechanism matching with the connection winding point is further disposed on the upper portion of the supporting device, the clamping mechanism includes a plurality of fixing brackets spaced from top to bottom, an optical fiber clamping groove having a width directly matching with the sensing optical fiber is disposed on the fixing bracket, and the sensing optical fiber is fixedly disposed on the supporting device through the fixing brackets.
7. The non-contact array type distribution optical fiber device of claim 6, wherein the number of the supporting devices is 1-6, the number of the fixing brackets is 1-60, the number of the shock absorbing devices is 2-8, and the number of the rubber pads is 2-8.
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